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System too lean

Tiny
VZE2DDHK
  • MEMBER
  • FORD THUNDERBIRD
:D I have a 1994 t-bird ls with a 4.6 engine and approx. 75k miles. I keep getting codes P0171, P0174 Mod $10 banks 1&2. Tells me that system is too lean. Can you tell me what my trouble may be.
Thank you
Monday, May 8th, 2006 AT 2:36 PM

1 Reply

Tiny
LOSONE
  • MECHANIC
  • 1,616 POSTS
A Ford Mass Air Flow sensor can set a lean code also a bad O2 sensor can do the same thing. If the MAP sensor is not working right it can cause the same thing.
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Monday, May 8th, 2006 AT 2:58 PM

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